GB/T 755.2 Methods for determining losses and efficiency of rotating electrical machinery from tests(excluding machines for traction vehicles)
IEC 60051-2 Direct acting indicating analogue electrical measuring instruments and their accessories - Part 2: Special requirements for ammeters and voltmeters*, 2018-07-31 Update
IEC 60051-3 Direct acting indicating analogue electrical measuring instruments and their accessories - Part 3: Special requirements for wattmeters and varmeters*, 2018-07-31 Update
IEC 60051-4 Direct acting indicating analogue electrical measuring instruments and their accessories title - Part 4: Special requirements for frequency meters*, 2018-07-31 Update
ISO 3966 Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes*, 2020-07-20 Update
ISO 5167-1 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements*, 2022-06-16 Update
ISO 5168 Measurement of fluid flow - Procedures for the evaluation of uncertainties
ISO 5221 Air distribution and air diffusion; Rules to methods of measuring air flow rate in an air handling duct
GB/T 1236-2017 history
2017GB/T 1236-2017 Industrial fan—Performance testing using standardized airways
2000GB/T 1236-2000 Industrial fans-Performance testing using standardized airways
1985GB 1236-1985 Test method for aerodynamic performance of ventilator